1-tertiaryamino alkanoyl - 2-hydrogen methyl or phenyl-3-methyl or phenyl-4-oxo-1 2 3 4-tetrahydroquinazolines

ABSTRACT

1,2,3,4-TETRAHYDROQUINAZOLINE DERIVATIVES OF THE GENERAL FORMULA:   1-(R-(CH2)N-CO-),2-R&#39;&#39;,3-R&#34;,4-(O=)-1,2,3,4-TETRAHYDRO   QUINAZOLINE   AND METHODS OF PREPARING SAME. THE COMPOUNDS POSSESS CHOLERETIC AND ANTIFIBRILLATORY ACTIVITY.

United States Patent O ffice 3,637,68l Patented Jan. 25, 1972 Int. Cl. C07d 87/42 US. Cl. 260-4472 21 Claims ABSTRACT OF THE DISCLOSURE 1,2,3,4-tetrahydroquinazoline derivatives of the general formula:

( 10(cH2)..R N H and methods of preparing same. The compounds possess choleretic and antifibrillatory activity.

The object of the present invention is new therapeutically active derivatives of 1,2,3,4-tetrahydroquinazoline of the general formula:

A 1 in which:

R is a dimethylamino, diethylamino, morpholino or piperidino radical, R is a hydrogen atom or a methyl or phenyl radical, R" is a methyl radical or a phenyl radical which is unsubstituted or substituted by a chlorine or bromine atom or by a methyl or methoxy group, and n is 1 or 2, as well as their acid addition salts.

Typical acid addition salts include the hydrochloride, hydrobromide, hydroiodide, sulfate and phosphate salts. The hydrohalide salts may be prepared, for example, by acidification of the base in alcoholic solution with an aqueous solution of the hydrochloric, hydrobromic or hydroiodic acid. By acidifying a solution of the base in acetone with 20% sulfuric acid, the sulfate is obtained, and with 85% phosphoric acid the phosphate is obtained.

These compounds are characterized by their choleretic and antifibrillatory activity. The compounds are indicated in cases of insufiiciency of hepatico-biliary secretion, cholangiopathy and hypercholesteremia. The compounds may be administered orally or parenterally in a dosage of 100 mg. two to six times per day.

l-morpholinoacetyl-3-phenyl-4-oxo-1,2,3,4 tetrahydroquinazoline is a particularly preferred compound.

The preferred method of preparing derivatives of Formula I consists in reacting a compound of the formula:

in which X is a reactive ester acid radical such as a chlorme atom or a p-toluene-sulfonate radical with a compound of the formula:

H-R III This reaction may be carried out readily by heating starting materials under reflux in benzene. It is advantageous to operate in the presence of an acid-fixing agent which may be an excess of the initial amine.

The tetrahydroquinazoline of Formula II can be prepared by acylation of a tetrahydroquinazoline of the formula:

IV by means of an acyl halide of the formula:

Hal-CO (CH ),,X V

The tetrahydroquinazoline of the Formula IV can be obtained by cyclization of an N-substituted 2-aminobenzamide of the formula:

OONHR by means of diethyl acetal of formaldehyde, acetaldehyde or benzaldehyde, depending on the nature of R.

Another method which can be used for the preparation of the derivatives of Formula I consists in acylating a tetrahydroquinazoline of Formula IV with an acyl halide of the formula:

Hal-CO(CH R VII in which Hal designates a halogen, preferably chlorine.

This acylation can be carried out in a solvent such as ace tone or chloroform.

The following examples serve to illustrate the invention.

EXAMPLE 1 1 morpholinoacetyl-3-phenyl-4-oxo-1,2,3,4 tetrahydroquinazoline A mixture of 300 g. (1 mol) of 1-chloroacetyl-3-phenyl- 4-oxo-1,2,3,4-tetrahydroquinazoline and 87 g. (2.2 mols) of morpholine in 3000 m1. of anhydrous benzene is heated under reflux for 5 hours.

After cooling, the solid product consisting of 1 mol of morpholine hydrochloride is filtered and collected. The benzene filtrate is extracted with 2000 ml. of 0.5 N hydrochloric acid (1 mol), whereupon the base is liberated by treating the hydrochloric extract with a 10% aqueous solution of sodium carbonate. The base is collected by filtration, dried and crystallized in isopropyl alcohol or acetone or ethyl acetate. 211 g. of the desired product are obtained In order to transform the base into hydrochloride, it can be dissolved in the stoichiometric quantity of 0.5 N hydrochloric acid, filtered and concentrated to a small volume under vacuum at 35-40 C. The base may also be dissolved in a mixture of benzene and ether, the solution acidulated by means of an ethanolic HCl solution, set aside for one night and the hydrochloride collected.

The initial l-chloroacetyl 3 phenyl 4 oxo-1,2,3,4- tetrahydroquinazoline can be prepared in the following manner. Into a mixture of 224 g. (1 mol) of 3-phenyl-4- oxo 1,2,3,4 tetrahydroquinazoline and 152 g. (1.1 mol) of anhydrous potassium carbonate in 2500 m1. of

in the following Table 11 there are listed the meltingpoints and analyses of starting quinazolines:

TABLE II Analysis, percent M P Calculated Found R R R '1 Formula N 01 N 01 CH2CH2C1 H CaHs 112-113 Ci7Hi5C1NzO2 8.90 11.27 9.00 11.19 CH2Cl H 011.0H. 150-153 Same 8.90 11.27 0.13 11.34 0121.01 H H. 179-181 CiuHnClNeOz 9.32 11.79 9.57 11.52 0112011201 H 051110111 133-135 01111110111202 8. 52 10.78 8.35 11.03 CH2C1 H CuHqClIH 114-116 Ci0Hi2C12N202 8.36 21.15 8.36 21.18 011201 H CQHtOCHQD 133-135 CiiHi5C1N2O: 8.47 10.72 8.72 10. 56 011201 H CoHtBII) 158-160 0.1111213110111201 7.33 9.34 7. 37 9. a1 CHzCl H nHtOHzO 125-126 01111150110102 8.90 11.27 9.13 11. 03 011201 CH9 CGNB s 3.90 11.27 9.11 11.00 011101 0111. CH: 8.90 11.27 ass 11.17

The following Table III illustrates the pharmacological TABLE III activities of many of the above described compounds.

Other The testing procedures were as follows: Ch0t1l8 A ufibrm t um LD phar-l Pharmacological Methods-Animals: NMRI albino acfli tyf w f ,d b.d ,a mute (18-20 g.) and W1star albino rats 200-250 g.) MgJkgwere used. For choleretic activity, 100 days old Wistar -3 3} albino female rats of 220-240 g. were used. 22 3% Acute toxicityLD values were determined in mice g: intraperitoneally, and the mortality over 5 days was re- 22:11:: 2% corded. The animals were also observed for behaviour g 1 and objective symptoms according to the Irwin scheme. 1%:111 g (S. Irwin: General philosophy and methodology of screen- 5. 2 ing, Gordon Research Conference-New London, 1959.) 3 Choleretic acivity--Female rats, after 14 hr. fasting and g3 anaesthetized with urethan, were used. The substances 2 :11:: were injected in the duodenum. The bile flow was reojjjjjjjj a0 corded 1 hr. before and 1 hr. after the administration of fgjjjjjjj 22-, the compounds, by means of a graduated pipette con- 23- Egg;

1 t h l nected to i cannu a 0 o edochus e Dose which increased the bile flow to 50 percent. Maximum tested Antifibrillator activit The compounds were iven doses were 14 01111)... Sodium dehydrocholate was active at 50 mg./kg.

y Y g b Dose which prevented the cardiac arrhythmia in 50 percent of animals. intravenously t0 fats anaesthetlzed With P61110133! bltal Max/ikmum tested doses were 1g of LB Procainamide was active at 50 v m dium, and their ability to prevent cardiac arrhythmias inmg lg t g ggfi 5 M g d t 5 r eent the i gart sensitivity to v 6880105 8. on. a 11111111 850 oseswere m. duced by CaCl was determined. Active compounds were d g i d parenthesgs are maximum tested non acme dos ueror oseswereto c, than tested on rabbit heart by the method of Visentim. Qu n1 dine was active at 2'8 mm! (P. Visentini, Arch. It. So. farmacoL, 4, 16 (1954).) The 332 6 a s-l heart was stimulated with a frequency of 50 per second 1 1 7 110515. Isl

I 0 000 Vl-l OHS- for 1 msec. The intensity which provoked the fibrilation 7 10 3. 13... acflvlty,fl b1 d d mm was recorded before and after 20 minutes of perfusion 55232.? a pressure an S antefiectm with the esting compounds. I 75 Inhibition of formalin edema of the paw.

1 1 What is claimed is: 1. A compound of the formula wherein R is dimethylamino, diethylamino, morpholino or piperidino;

and R" is and alk is methylene.

8. The compound of claim 2, wherein R is hydrogen and R is and alk is methylene.

9. The compound of claim 2, wherein R is hydrogen, R" is phenyl and alk is ethylene.

10. The compound of claim 3, wherein R is hydrogen, R is phenyl and alk is ethylene.

11. The compound of claim 2 wherein R is hydrogen,

and alk is ethylene.

12. The compound of claim 3, wherein R is hydrogen, R is phenyl and alk is methylene.

13. The compound of claim 5, wherein R is hydrogen,

and alk is methylene.

14. The compound of claim 2, wherein R is hydrogen, R is and alk is methylene.

15. The compound of claim 5, wherein R is hydrogen, R is and alk is methylene.

16. The compound of claim 3, wherein R is hydrogen, R" is and alk is methylene.

17. The compound is claim 4, wherein R is hydrogen, R is and alk is methylene.

18. The compound of claim 3, wherein R is hydrogen, R is O CH and alk is methylene.

19. The compound of claim 2, wherein R is hydrogen,

R" is and alk is methylene.

20. The compound of claim 1, wherein R is hydrogen, R" is and alk is methylene.

21. The compound of claim 1, wherein R is phenyl, R is methyl and alk is methylene.

No references cited.

ALEX MAZEL, Primary Examiner J. TOVAR, Assistant Examiner US. Cl. X.R. 

